FIRST LISTEN: Four Britney Spears Songs

PEOPLE got its hands on snippets of four songs from Britney Spears‘s much-talked-about new album, Blackout. (Hear the tracks below.)

The disc is due out Oct. 30 – two weeks earlier than initially planned because of concerns over Internet leaks. Her label, Jive, is now taking matters into its own hands, releasing an audio player with the official versions of the songs “Radar,” “Piece of Me,” “Break the Ice” and “Heaven.”